Officer Kenneth Lopera, 31, was arrested on involuntary manslaughter and oppression under color of office charges in the death of 40-year-old Tashii Brown.

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The officer repeatedly fired a stun gun at Brown, punched and used a chokehold on him. Lopera thought the suspect had tried to carjack a vehicle at the Venetian Hotel on the Las Vegas Strip last month, officials said.

Police were investigating of the death of an unarmed black man, Tashii Farmer-Brown, at The Venetian Hotel and Casino in Las Vegas, last month. (Las Vegas Metropolitan Police)

The Clark County coroner's office determined Brown, who also used the name Tashii Farmer, had died of asphyxiation. The autopsy report revealed Brown was intoxicated with methamphetamine and had an enlarged heart.

Surveillance video and body-cam footage captured the encounter, which shows Brown lying on his back with his arms raised as the officer fired the stun gun.

Las Vegas police Undersheriff Kevin McMahill speaks during a news conference in May about the incident. (John Locher/AP)

"Please! Please!" Brown cried in the video.

The two men then struggled as the officer tried to handcuff Brown. Lopera punches him in the head and neck before putting him in a chokehold, according to the Las Vegas Sun.

Brown lost consciousness and was taken to a hospital where he was pronounced dead.

If convicted, Lopera faces up to eight years in state prison for both charges.